r willauer



April 23, '1931- w. R. WILLAUER 1,802,857

METHOD AND MACHINE FOR MAKING PAPER TUBES Filed Oct. 12, 1928 2 Sheets-Sheet l alike mm April 28, 1931. w. R. WILLAUER METHOD AND MACHINE FOR MAKING PAPER TUBES 1928 2 Sheets-Sheet 2 Filed Oct. 12

jwventoa I W VV/LLHUE Patented Apr. 28, 1931 WILLIAM R. WILLAUER, SPARTANIBUBG, SOUTH CAROLINA METHOD AND .MACHINE FOR MAKING PAPER TUBES Application filed October 12, 1928. Serial No. 312,193.

This invention relates to that class of paper-tube manufacturing in which sheets of paper are curled intocylindrical shape, with their adjacent edges overlapping and pasted permanently together, and an object of this invention is to provide a simple and inexpensive machine for curling and pasting the tube, the securing of the overlapped edges of the tube being done in such manner that the joint is virtually a welded joint, to

the line 66 of Fig. 4;

.Fig. 7 is a horizontal sectional view of the completed paper-tube.

Referring to the drawings annexed by reference-characters, 10 designates a baseplate mounted on a suitable frame and adapted to support a cylindrical vertical core consisting of a front stationary semi-cylindrical member 11 and a rear semi-cylindrical section designated 12. "this latter section being vertically movable with respect to the.

base 10, for the purpose of collapsing the core in removing the curled blank. The vertically-movable section 12 is hingedly connected to the front stationary section by means of pairs of links 13, arranged in such manner that, when the movable section 12 rests, by gravity, on the base-plate 10, the links will be substantially horizontal, so that, when the movable section is at rest, the cylindrical core will be completed and so that when the movable section 12 is raised it will automatically, bodily move toward the front stationary section and thus collapse the core sufliciently to remove the shaped paper cylinder.

Any suitable means may be used for raisin the movable section 12. I have shown a flui pressure cylinder 14 whose combined inlet and outlet valve 15 is operable by means of an arm 16 connected to a rod 17 which extends to the front part of the machine for convenient operation by the foot or hand of the attendant. lVith this device, or any equivalent mechanism, the movable section may be raised to collapse the core and, after the curled sheet is removed, it will be dropped back in place on the base.

The forward side of the front, stationary section 11 is heated along its front vertical side by means of a tube 18 connected at its upper end to a steam-supplying-pipe 19 and at its lower end to an outlet-pipe 20. The paper sheet, designated by the numeral 21, is curled around the core 11-12 by means of. a pair of semi-circular plates 22 hinged at the rear of the core to a vertical pintle 23 supported on an adjacent part of the frame. These fl two plates are made hollow for the reception of steam for heating them, the steam being supplied to these plates through the medium of suitable flexible pipes 24. These plates 22 reach nearly around the core, leaving a comparatively narrow space at the front sideof the core for the .reception of a vertical pasting-bar 25 which, when in place between 5 the ends of the plates 22, completes the cylindrical curling means.

The two semi-cylindrical curlingor bending-plates 22 are. swung forwardly and, backwardly on the pintle 23 in any suitable U manner. I have shown the following mechanism for doing this: Upon a slidable bar 26 I fasten a yoke 27 whose arms extend forwardly and are connectedby links 28 to the 0 plates 22, said rod 26 being slidable back and forth by a foot-operated angle-lever 29 connected to the rod by means of a link 30, the pedal-end of this angle-lever extending to the front of the-machine, where it will-be.. convenient for the operator to manipulate it by means of his foot. A retractile spring 31, shown in Fig. 1, is employed to normallypull upwardly on the pedal-end of the angle-lever 29 and thus normally open the curling-plates.

22. To hold the curling-plates in closed position, upon the core, I employ a latch device 32, or I may depend upon the pressure of the foot of the operator alone.

In curling the sheet 21, the curling-plates are allowed'to swing outwardly and backwardly to the position shown in dotted lines in Fig. 4; then the sheet is slipped down vertically between the curling-plates and the section 12 of the coreywhich section at that time rests on the base 10; then the curlingplates are swung forwardly to thus curl the sheet '21 around the core with its vertical edges in overlapped relation, as shown in Fig. 4; paste is then applied to the overlapped parts of the sheet and the sealing-bar25 is forced toward the adjacent face of the core.

To operate the sealing-bar, I connect the same to a pair of piston-rods'33 connected to pistons working in cylinders 34. I supply steam or compressed air to these c linders in any suitable manner to first move t e sealingbar forwardly into sealing position and then move it awa from the core to release the sealed 0 lin rical sheet. For this purpose, I provi e a valve in the steam-supply pipe which controls the entrance and exit of fluid to the branch-pipes 36 leadin to the forward end of the cylinder and the ranch-pipes 37 leading to the rear end of the cylinder. Any other suitable means ma be employed for forcibly pressing the sea 'ng-bar 25 against the sheet wound on the core and for retractin it therefrom to enable the pasted completed cylinder to be removed from the core. The sealing-bar 25 is made hollow for the reception of steam supplied to it through a flexible pipe 38.

After the cylindrical sheet is thus shaped and pasted and the back core-member 12 is raised to collapse the core, it may be desirable to employ some device for loosening the paper cylinder from the core, as in some cases it may stick to the surface of the front stationary core-section 11. For this purpose, I may use a fork 39 mounted on the base 10 and having fingers 40 adapted to engage under the lower edge of the paper cylinder, adjacent the overlapped seal, and provide a piston-rod 41 operable vertically by a piston working in a cylinder 42, this cylinder being provided with a valve 43 operable by an arm 44 connected to the aforesaid rod 17, whereby the forked ejector 39 may be raised and lowered at will. A

lost-motion slot 45 is provided between the arm 44 and the arm 17 so that the ejector-piston in cylinder 42 will be elevated immediately after the movable section 12 of the core is elevated. The valves 15 and 43 will, of course, be so constructed as to release the fluid from the pistons when the rod 17 is again pulled forwardly, to thus permit the ejectorfork 39 and the core-section 12 to return to normal position.

Paste is desirably applied to the overlapped edges of the paper cylinder after the c linder is curled around the core. The paper prefer employing is of a kind which softpaper, and I prefer putting the sealing-bar 25 .mdersufficient heat and pressure to virtually weld the overlapped joint, i. e., soften the paper and press the overlapped parts together so intimately that the joint is virtually eliminated. I use a casein waterproof paste of well-known make, so that the paste under the action of heat and )ressure entirely disappears into the body 0 the paper-sheet. In Fig. 7, the completed paper-cylinder is shown. It will be observed that the lines of the joint have disappeared and that the paper is slightly thickened at the place of jointure. Even this-extrathickness may be entirely eliminated by increasing the pressure, as the pressure will suificiently condense the overlapped portions to make the wall of the cylinder at the jointure approximately the thiclmess of the wall at other points in the cylinder. I propose using these welded paper-cylinders for shipping ice-cream, etc., where a. waterproof paper having a permanent, inseparable waterproof joint is needed. In my experiens under heat, i. e., a sulphur-impregnated ments, I have found that with sufficient heat and pressure I can make the overlapped edges of the sheet become virtually one, the heat serving to soften the paper sufliciently to permit the pressure to coalesce the overlapped parts and to cause the casein paste to be entirely absorbed in the overlapped parts of the sheet and thus virtually disappear, leaving no layer of paste between the overlapped parts.

In accordance with the provisions ofthepat-' ent statutes, I have herein described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiments thereof, but I desire to have it understood that the apparatus disclosed is only illustrative and that the invention can be carried out by other means. Also, while it is designed to use the various features and elements in the combinations Reaction between the sulphur and the pa- 4 per and the casein paste at 230 F. brings about a combination of sulphur and casein to produce casein hydrolytic products. Since the medium, namely, casein paste, is an alkaline one, some of the sulphur would be present as alkaline sulphide. It has been found that alkaline sulphites (and also sulphides to a less degree) increase the heat coagulability or heat gel formation of proteins and likewise lower the coagulation temperature. The result is that the sulphur in the paper causes the casein to act just the reverse of its natural chemical action. Casein glue is recognized as a very slow-setting water-proof glue, and its use with a sulphur-impregnated paper causes not only a quicker setting but also a stronger adhesion in addition to waterproofness.

What I claim as new is:

1. In a paper-tube forming machine, a core, a pair of swinging bending-plates and means for operating them, a pasting-bar adapted to enter between the ends of said bending-plates and press toward the core, and means for actuating this pasting-bar.

2. In a paper-tube forming machine, a core, a pair of swinging bending-plates and means for operating them, a pasting-bar adapted to enter between the ends of said bending plates and press toward the core, and means for actuating this pastingbar, means being provided whereby the pastingbar and the core are heated at the time of pressure on the oint.

3. In a paper-tube curling machine, a core having a longitudinally-movab1e section, means for moving this section to collapse the core, a pair of swingin semi-circular bending-sections, a pastingar adapted to enter between the ends of said sections and press against the overlapped joint of the enclosed paper-tube, and means for forcing this bar a ainst the joint, means being provided wiereby the core and the pasting-bar and said swinging sections are heated.

4. In a paper-tube forming machine, a core, a pair of swinging bending-plates and means for operating them, a pasting-bar adapted to enter between the ends of said bending-plates and press toward the core, and means for actuating this pasting-bar, an ejector mechanism being provided for slidingly separating the formed and pasted tube from the core.

The method herein described of forming seamless paper-tubes consisting in curling a sheet made of paper impregnated with a composition softenable under heat to cause the adjacent edges thereof to overlap, applying waterproof paste to the overlapped portions to form a joint, and applying heat and pressure to the paste d portions to cause the paste to impregnate the overlapped portions and weld said overlapped portions into an integral relation.

In testimony whereof I hereunto afiix my signature.

WILLIAM R. WILLAUER. 

